@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900&family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;0,900;1,100;1,300;1,400;1,500;1,700;1,900&display=swap');

:root {
    --line-border-fill: #2563EB;
    --line-border-empty: #4c4b4b;
    --background-dark: #1A1A1A;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 2em;
    align-items: center;
    justify-content: center;
    background-color: var(--background-dark);
    height: 100vh;
    overflow: hidden;
    font-family: "Roboto", sans-serif;
}

h1 {
    color: white;
    font-size: 2rem; /* Scalable font size */
}

.container {
    text-align: center;
}

.progress-container {
    display: flex;
    position: relative;
    justify-content: space-between;
    max-width: 100%;
    width: 600px;
    margin-bottom: 3em;
}

.progress-container::before {
    content: '';
    background-color: var(--line-border-empty);
    position: absolute;
    height: 4px;
    width: 100%;
    top: 50%;
    transform: translateY(-50%);
    z-index: -1000;
    transition: 0.4s ease;
}

.progress {
    background-color: var(--line-border-fill);
    position: absolute;
    height: 4px;
    width: 0%;
    top: 50%;
    transform: translateY(-50%);
    z-index: -1000;
    transition: 0.4s ease;
}

.circle {
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    background-color: var(--background-dark);
    height: 70px;
    width: 70px;
    border-radius: 50%;
    border: 3px solid var(--line-border-empty);
    transition: 0.4s ease;
}

.circle.active {
    border: 3px solid var(--line-border-fill);
}

#btns {
    display: flex;
    justify-content: space-evenly;
}

.btn {
    background-color: var(--line-border-fill);
    color: white;
    padding: 0.5em 2em;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    margin: 0.5em;
    font-size: 1.2em;
}

.btn:active {
    transform: scale(0.98);
}

.btn:focus {
    outline: 0;
}

.btn.disabled {
    background-color: var(--line-border-empty);
    cursor: not-allowed;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container{
        width: 80%;
    }
    .progress-container {
        width: 100%; /* Reduce width proportionally */
    }

    .circle {
        height: 60px; /* Reduce size */
        width: 60px;
    }

    .btn {
        font-size: 1em; /* Scale font size */
        padding: 0.5em 1.5em;
    }

    h1 {
        font-size: 1.8rem; /* Slightly smaller header */
    }
}

@media (max-width: 480px) {

    .container{
        width: 80%;
    }
    .progress-container {
        width: 100%; /* Further reduce width */
    }

    .circle {
        height: 50px; /* Smaller circles */
        width: 50px;
    }

    .btn {
        font-size: 0.9em; /* Adjust font size */
        padding: 0.5em 1em;
    }

    h1 {
        font-size: 1.5rem; /* Scale down heading further */
    }
}